Long life rotating body with excellent fatigue strength and method of manufacturing the rotating body
A technology of fatigue strength and rotating body, applied in the field of long-life rotating body and its manufacturing
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[0049] The effects of the present invention will be described with reference to an example of an automobile wheel made of steel plate in the present invention.
[0050] For 13-inch wheels of automobiles, the treatment method was changed to compare the fatigue strength. In addition, the wheel disc used here is made of a plate with a thickness of 3.2mm and a strength of 690N / mm 2 And plate thickness 4.0mm, strength 330N / mm 2 processed from materials.
[0051] The fatigue test is carried out with a rotating bending moment (bending moment) load. The alternating speed is 700rpm, the bolt tightening torque is 98Nm, and the test torque is 1.47KNm.
[0052] In addition, as the initial crack before the treatment, a notch with a depth of 200 μm was artificially made at the end of the punched hole, and the corresponding part was cut out after the test, and the crack length was measured. The results are shown in Table 1.
[0053] No.
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steel
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